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Renesas RD20ES-T4-AZ
- Part No.:
- RD20ES-T4-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD20ES-T4-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
RD20ES-T4-AZ from Renesas Electronics is a 20 V ±5% zener diode in DO-34 glass package with 400 mW power dissipation, 30 Ω dynamic impedance at 5 mA, and 0.2 µA reverse leakage at 15 V, used for precision voltage regulation and surge suppression in low-power analog circuits.
For engineers reviewing the RD20ES-T4-AZ datasheet, RD20ES-T4-AZ pinout, RD20ES-T4-AZ application, or RD20ES-T4-AZ equivalent, this page provides verified electrical specs, thermal behavior, DHD construction benefits, JEDEC-compliant DO-34 mechanical data, and real-world selection guidance for voltage reference and transient protection use cases.
Technical Context
This planar-processed zener diode uses Double Heatsink Diode (DHD) construction to enhance thermal dissipation in the compact DO-34 package, enabling stable 20 V regulation under continuous 400 mW load. Its knee impedance is 200 Ω at 0.5 mA, supporting low-current biasing in sensor interfaces and reference dividers.
Rated for 175°C junction temperature and –65°C to +175°C storage, RD20ES-T4-AZ exhibits a positive temperature coefficient of +8.0 mV/°C near 20 V, making it suitable for temperature-compensated references when paired with negative-TC components. Surge capability reaches 100 W for 10 µs pulses per Fig. 10.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.23 V to 20.45 V at IZ = 5 mA - defines tight 20 V regulation window for stable reference generation |
| Dynamic Impedance (ZZ) | 30 Ω max at IZ = 5 mA - ensures minimal output voltage shift under load variation in feedback networks |
| Knee Impedance (ZZK) | 200 Ω max at IZK = 0.5 mA - supports reliable conduction onset in low-current biasing applications |
| Reverse Leakage (IR) | 0.2 µA max at VR = 15 V - enables high-impedance node stabilization without loading sensitive circuits |
| Power Dissipation (P) | 400 mW at TA = 25°C - sets maximum continuous DC power handling on standard PCB layouts |
| Surge Power (PRSM) | 100 W for t = 10 µs - provides robust transient clamping against ESD and inductive spikes |
| Junction Temperature (Tj) | 175°C max - allows operation in high-ambient industrial environments with appropriate derating |
Pinout & Package
RD20ES-T4-AZ is a two-terminal axial-leaded device in JEDEC DO-34 glass package (body length ≤2.4 mm, diameter ≤2.0 mm), with cathode indicated by black band. Leads are tin-plated copper-clad steel, compatible with wave and reflow soldering per manufacturer guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; establishes reference return path for regulation |
| Cathode | Zener breakdown terminal / regulated output node | Supplies stable 20 V to load; must be decoupled with local capacitor for noise-sensitive applications |
Key Features
| Feature | Design Value |
|---|---|
| DHD (Double Heatsink Diode) construction | Enables 400 mW dissipation in DO-34 by doubling thermal paths through both leads, improving reliability vs. standard DO-34 zeners |
| Planar process technology | Delivers tight VZ tolerance (±5%) and repeatable ZZ across production lots for consistent reference performance |
| E24-standard zener voltage | Aligns with preferred-value series for seamless integration into legacy and new designs requiring 20 V regulation |
| Short-pitch lead spacing (5 mm) | Supports dense PCB layouts in space-constrained consumer and industrial modules without compromising solder joint integrity |
| Black cathode marking | Provides unambiguous polarity identification during manual assembly and automated optical inspection (AOI) |
Applications
| Industrial Sensor Signal Conditioning | Low-Power Microcontroller Reference |
|---|---|
|
Use Scenario: Stabilizing excitation voltage for resistive bridge sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed 20 V bias to strain gauge bridges. Use Value: Maintains <±0.5% full-scale accuracy over –25°C to +70°C ambient due to predictable TC and low ZZ. |
Use Scenario: Generating precise 20 V supply for ADC reference in battery-powered IoT edge nodes. IC Role / Device Role / Timing Role: Low-quiescent current voltage shunt regulator feeding external VREF pin. Use Value: Enables 12-bit ADC linearity within spec using only 0.2 µA leakage and 30 Ω output impedance. |
| Audio Equipment DC Rail Clamp | Surge Protection in Telecom Line Interface |
|
Use Scenario: Clamping transient spikes on ±15 V op-amp rails in studio preamplifiers. IC Role / Device Role / Timing Role: Fast-response shunt protector absorbing short-duration overvoltage events. Use Value: Limits rail excursion to ≤21 V during 10 µs surges up to 100 W, preventing op-amp latch-up. |
Use Scenario: Secondary-level surge suppression on 24 V ring/sleeve telecom interface lines. IC Role / Device Role / Timing Role: Standby zener clamp activated during lightning-induced transients. Use Value: Withstands repeated 100 W/10 µs pulses without parameter drift, meeting GR-1089-CORE Level 3 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | 20 V nominal, 1 W rating, DO-41 package, 25 Ω ZZ, 50 µA IR at 16 V | Higher power but larger footprint; less suitable for space-constrained PCBs | Choose when >400 mW continuous dissipation is required and board area permits DO-41 |
| BZX55C20 | 20 V nominal, 500 mW rating, DO-35 package, 50 Ω ZZ, 0.1 µA IR at 15 V | Lower leakage but higher impedance; tighter VZ tolerance (±5% same) | Prefer where ultra-low leakage dominates over dynamic regulation stability |
Compared with RD20ES-T4-AZ, 1N4744A offers higher surge margin but requires layout revision for DO-41; BZX55C20 reduces leakage by 50% yet sacrifices 67% more dynamic impedance, impacting regulation fidelity in active feedback loops.
Availability
RD20ES-T4-AZ is available at Aetrix Electronics and suitable for industrial sensor conditioning, low-power microcontroller reference, audio rail clamping, and telecom surge protection requiring stable component supply across long-lifecycle embedded programs.
Supply support for RD20ES-T4-AZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and enterprise applications.
RD20ES-T4-AZ belongs to the legacy NEC RD2.0ES–RD39ES zener diode family, designed specifically for high-reliability, low-profile voltage regulation and transient suppression in cost-sensitive industrial and consumer electronics.
FAQ
What is the exact zener voltage range for RD20ES-T4-AZ at 5 mA test current?
The RD20ES-T4-AZ has a guaranteed zener voltage range of 20.23 V to 20.45 V when measured at IZ = 5 mA and TA = 25°C, per the "AB3" suffix row in the Electrical Characteristics table of Renesas document D13935EJ7V0DS. This 20 V nominal rating follows E24 standard values and reflects ±5% tolerance across production lots.
Does RD20ES-T4-AZ support surface-mount assembly or only through-hole mounting?
RD20ES-T4-AZ is a DO-34 axial-leaded glass diode intended exclusively for through-hole mounting. Its 5 mm lead pitch and glass body are incompatible with standard SMT reflow profiles. While hand-soldering or wave soldering is supported, no SMD variant (e.g., SOD-123 or DO-213AA) exists for this specific part number.
What is the thermal resistance from junction to ambient for RD20ES-T4-AZ on a standard PCB?
Per Figure 7 in the RD20ES-T4-AZ datasheet, the thermal resistance (RthJA) is approximately 375°C/W on a 7 mm² PCB (t = 0.035 mm). This value scales inversely with copper area-doubling the pad size reduces RthJA by ~25%. Derating curves in Figure 6 confirm 400 mW is only sustainable up to ~70°C ambient with minimal copper.
Can RD20ES-T4-AZ be used in place of a 20 V zener with tighter tolerance like ±1%?
No-RD20ES-T4-AZ has a fixed ±5% tolerance (20.23–20.45 V), and no tighter-tolerance version exists in the RD2.0ES–RD39ES series. For ±1% applications, consider precision references such as REF5020 or discrete trimmed solutions; RD20ES-T4-AZ is optimized for cost-sensitive, non-critical regulation where E24 alignment and DHD thermal performance outweigh absolute accuracy.
Is RD20ES-T4-AZ qualified for automotive applications per AEC-Q200?
No-RD20ES-T4-AZ carries "Standard" quality grade per Renesas documentation, rated for computers, office equipment, and industrial robots-not automotive systems. It lacks AEC-Q200 stress testing, extended temperature validation beyond 175°C junction, or zero-defect screening. For automotive use, select AEC-Q200-qualified zeners like the TZM series from ON Semiconductor or BZX84-C20LT1G from Diodes Inc.
RD20ES-T4-AZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
RD20ES-T4-AZ FAQ
1.How can I place an order for RD20ES-T4-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD20ES-T4-AZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for RD20ES-T4-AZ reliable?
The price and inventory of RD20ES-T4-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD20ES-T4-AZ is usually 5 days.
3.What payment methods are accepted for RD20ES-T4-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD20ES-T4-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD20ES-T4-AZ?
RD20ES-T4-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD20ES-T4-AZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for RD20ES-T4-AZ?
For technical support, including RD20ES-T4-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD20ES-T4-AZ requirements.
6.How does Aetrix verify that RD20ES-T4-AZ is sourced from the original manufacturer or authorized distributors?
All RD20ES-T4-AZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that RD20ES-T4-AZ meets industry standards.
7.What is the process for return or replacement of RD20ES-T4-AZ?
All RD20ES-T4-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD20ES-T4-AZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The RD20ES-T4-AZ part is unused and in its original packaging.
Return procedure for RD20ES-T4-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD20ES-T4-AZ Tags
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MM5Z5V1ST1G
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